There's only three people in this house,
and you'd still be my FIFTH guess.
The Big Bang Theory Season 10, Episode 10
You, uh, moving into the apartment
on the FIFTH floor?
The Big Bang Theory Season 6, Episode 8
I was done with Latin by FIFTH grade.
The Big Bang Theory Season 3, Episode 2
Leslie Winkle is the FIFTH girl
I've ever had sex with.
The Big Bang Theory Season 2, Episode 16
you wouldn't have been FIFTH
on my list.
The Big Bang Theory Season 12, Episode 7